Hong Kong singer G.E.M. was singing mid-way when a stage lift malfunctioned during her fourth concert in Shenzhen, China, on Sept 19. In videos posted by concertgoers on social media, the stage lift jams for a few seconds before moving up and down. Afterwards, it made a slow descend but started shaking. G.E.M., 35, can be seen gripping on to one of the handlebars while she sang. After the song, she asked her fans: "Do you guys know what happened just now?" She told them the lift had broken down and made loud noises, adding: "My legs are still shaking now. I was so scared. When I was in the lift, I felt like I was about to pee my pants on…